<!--$Id: set_func_seek.so,v 10.19 2004/09/20 14:29:50 mjc Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: db_env_set_func_seek</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <h3>db_env_set_func_seek</h3> </td> <td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a> <a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> int db_env_set_func_seek(int (*func_seek)(int fd, off_t offset, int whence)); </pre></h3> <hr size=1 noshade> <h3>Description: db_env_set_func_seek</h3> <p>The Berkeley DB library requires the ability to specify that a subsequent read from or write to a file will occur at a specific location in that file.</p> <p>The db_env_set_func_seek method configures all operations performed by a process and all of its threads of control, not operations confined to a single database environment.</p> <p>Although the db_env_set_func_seek method may be called at any time during the life of the application, it should normally be called before making calls to the <a href="../../db46-devel-4.6.21/api_c/env_class.html">db_env_create</a> or <a href="../../db46-devel-4.6.21/api_c/db_class.html">db_create</a> methods.</p> <p>The db_env_set_func_seek method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <dl compact> <dt><b>func_seek</b><dd>The <b>func_seek</b> parameter is the function which seeks to a specific location in a file. <p>The <b>fd</b> parameter is an open file descriptor on the file.</p> <p>The <b>seek</b> function must cause a subsequent read from or write to the file to occur at the byte offset specified by the <b>offset</b> parameter.</p> <p>The <b>whence</b> parameter specifies where in the file the byte offset is relative to, as described by the IEEE/ANSI Std 1003.1 (POSIX) <b>lseek</b> system call.</p> <p>The <b>func_seek</b> function must return the value of <b>errno</b> on failure and 0 on success.</p> </dl> <h3>See Also</h3> <a href="../../db46-devel-4.6.21/ref/program/runtime.html">Run-time configuration</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a><a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>